Variable pitch servo driver with controllable rectification as input and driving method thereof
A technology of a servo driver and a driving method, which is applied to the conversion of AC power input to DC power output, renewable energy integration, and output power conversion devices, etc. Conducive to stable control and the effect of reducing drive failure rate
Pending Publication Date: 2021-04-13
SUZHOU GEYUAN ELECTRICAL
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Problems solved by technology
Most of the current pitch drive input rectification is uncontrollable. When the grid voltage fluctuates too much or the harmonic pollution is serious, the bus voltage of the drive will exceed the normal voltage range, and the drive will frequently report input overvoltage / bus Overvoltage failure not only affects normal power generation but also poses safety hazards
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] See figure 1 As shown, one embodiment of the present invention is a pitch servo drive whose input is controllable rectification. The drive includes a three-phase AC detection unit, a controllable rectification module, a power-on buffer unit, an auxiliary power supply, a control unit, and an energy storage capacitor , the input ends of the three-phase alternating current detection unit, the controllable rectification module, and the power-on buffer unit ...
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The invention provides a variable pitch servo driver with controllable rectification as input and a driving method thereof. The driver comprises a three-phase alternating current detection unit, a controllable rectification module, a power-on buffer unit, an auxiliary power supply, a control unit and an energy storage capacitor, wherein the input ends of the three-phase alternating current detection unit, the controllable rectification module and the power-on buffer unit are connected with three-phase alternating current, and the output end of the power-on buffer unit is connected with the output end of the controllable rectification module; the output end of the controllable rectification module is connected with the energy storage capacitor and then connected with the input end of the auxiliary power supply, the output end of the auxiliary power supply is connected with the power supply input end of the control unit, and the control unit is connected with the controllable rectification module and provides rectification control signals. Compared with an uncontrollable diode rectification circuit, the controllable rectification DC bus voltage is relatively stable, and stable control of driver output is facilitated.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a servo driver used in a wind power generation pitch system and a driving method thereof. Background technique [0002] At present, the mainstream rectification circuit of the pitch servo driver is an uncontrollable three-phase full-bridge rectification bridge composed of 6 diodes, which is then rectified into a relatively stable DC after being filtered by a capacitor. The relationship between the rectified DC voltage Udc and the input three-phase AC voltage Uac is Udc=√2*Uac. It can be seen from the formula that the rectified and filtered DC bus voltage Udc and the grid input three-phase AC voltage Uac have a linear relationship, and the DC bus voltage Udc will decrease or increase with the decrease of the input three-phase AC voltage Uac. When the DC bus voltage Udc reaches the upper limit of the safety voltage set by the driver, the driver will report an input o...
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IPC IPC(8): H02M7/162H02H7/125H02J9/06
CPCH02M7/1626H02H7/1252H02J9/061Y02B10/70
Inventor 陈志领陆卫丽肖庆恩
Owner SUZHOU GEYUAN ELECTRICAL